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// A Texbook on POWER SYSTEM ENGINEERING
// A.Chakrabarti, M.L.Soni, P.V.Gupta, U.S.Bhatnagar
// DHANPAT RAI & Co.
// SECOND EDITION
// PART IV : UTILIZATION AND TRACTION
// CHAPTER 1: INDUSTRIAL APPLICATIONS OF ELECTRIC MOTORS
// EXAMPLE : 1.16 :
// Page number 697-698
clear ; clc ; close ; // Clear the work space and console
// Given data
p = 6.0 // Number of poles
f = 50.0 // Frequency(Hz)
R_2 = 0.3 // Rotor resistance per phase(ohm)
N_1 = 960.0 // Rotor speed(rpm)
N_2 = 800.0 // New rotor speed with external resistance(rpm)
// Calculations
N_s = 120*f/p // Synchronous speed(rpm)
S_1 = (N_s-N_1)/N_s // Slip at full load
S_2 = (N_s-N_2)/N_s // New slip
R = (S_2/S_1*R_2)-R_2 // External resistance per phase added in rotor circuit to reduce speed(ohm)
// Results
disp("PART IV - EXAMPLE : 1.16 : SOLUTION :-")
printf("\nExternal resistance per phase added in rotor circuit to reduce speed, R = %.1f ohm", R)
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